linux-kernel - Re: [PATCH v2 1/2] Changes in w1_therm.c and adding w1

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Date:   Tue, 28 Apr 2020 15:42:20 +0200
From:   Akira shimahara <akira215corp@...il.com>
To:     Greg KH <greg@...ah.com>
Cc:     zbr@...emap.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] Changes in w1_therm.c and adding w1_therm.h

Le mardi 28 avril 2020 à 14:44 +0200, Greg KH a écrit :
> On Sun, Apr 26, 2020 at 07:20:30PM +0200, Akira shimahara wrote:
> > Le dimanche 26 avril 2020 à 19:09 +0200, Greg KH a écrit :
> > > On Sun, Apr 26, 2020 at 02:36:52PM +0200, Akira shimahara wrote:
> > > > Le dimanche 26 avril 2020 à 09:51 +0200, Greg KH a écrit :
> > > > > On Sat, Apr 25, 2020 at 05:31:41PM +0200, Akira Shimahara
> > > > > wrote:
> > > > > > From: Akira SHIMAHARA <akira215corp@...il.com>
> > > > > > 
> > > > > > Patch for enhacement of w1_therm module. Added features :
> > > > > >  - Bulk read : send one command for all the slaves
> > > > > >  		on the bus to trigger temperature conversion
> > > > > >  - Optimized conversion time regarding to device resolution
> > > > > >  - Dedicated sysfs entry for powering read,
> > > > > >  		resolution set/get, eeprom save/restore
> > > > > >  - Alarms settings and reading
> > > > > >  - Code optimization to mitigate bus traffic
> > > > > >  		(devices information are stored to avoid
> > > > > > 		interrogating each device every-time)
> > > > > > 
> > > > > > Following sysfs entry are added :
> > > > > >  - temperature (RO) : return the temperature in 1/1000°
> > > > > >  - ext_power (RO) : return the power status of the device
> > > > > >  - resolution (RW) : get or set the device resolution
> > > > > > (supported
> > > > > > devices)
> > > > > >  - eeprom (WO) :trigger a save or restore to/from device
> > > > > > EEPROM
> > > > > >  - alarms (RW) : read or write TH and TL in the device RAM
> > > > > >  - therm_bulk_read (RW) : Attribute at master level to
> > > > > > trigger
> > > > > >  		bulk read and to survey the progress of devices
> > > > > > conversions
> > > > > >  - w1_slave has been kept for compatibility
> > > > > > 
> > > > > > Main motivation was to improve temperature reading speed,
> > > > > > which
> > > > > > depend
> > > > > > on resolution settings of devices. The module store the
> > > > > > powwer
> > > > > > status and
> > > > > > the resolution of each device so that during reading
> > > > > > operation,
> > > > > > no
> > > > > > transaction is required on the bus, which improve speed.
> > > > > > The hardware status is checked as soon as a new device is
> > > > > > detected, 
> > > > > > when a user change occurred, or when the corresponding sys
> > > > > > file
> > > > > > is 
> > > > > > accessed by user.
> > > > > > 
> > > > > > The bulk read allow to trigger convserion of all devices on
> > > > > > the
> > > > > > bus
> > > > > > at
> > > > > > the same time. It will apply a strong pull up on the line
> > > > > > if at
> > > > > > least
> > > > > > one device required it. The duration of the pull up is the
> > > > > > max
> > > > > > time
> > > > > > required by a device on the line.
> > > > > > 
> > > > > > Please let me know any feedback you have on this patch.
> > > > > > 
> > > > > > Thanks ahead,
> > > > > > 
> > > > > > Signed-off-by: Akira Shimahara <akira215corp@...il.com>
> > > > > > ---
> > > > > > Changes in v2:
> > > > > >  - Adding documentation in Documentatin/ABI/testing/sysfs-
> > > > > > driver-
> > > > > > w1_therm
> > > > > >  - Updating existing documentation in
> > > > > > Documentation/w1/slaves/w1_therm.rst
> > > > > > 
> > > > > >  drivers/w1/slaves/w1_therm.c | 1406
> > > > > > ++++++++++++++++++++++++++--
> > > > > > ------
> > > > > >  drivers/w1/slaves/w1_therm.h |  386 ++++++++++
> > > > > >  2 files changed, 1470 insertions(+), 322 deletions(-)
> > > > > >  create mode 100644 drivers/w1/slaves/w1_therm.h
> > > > > 
> > > > > No documentation files are added here :(
> > > > > 
> > > > 
> > > > It's in the PATCH 2/2 included in the previous mail. You want
> > > > me to
> > > > merge in one commit ?. I thought it was easier for you to keep
> > > > a
> > > > track
> > > > of the v1.
> > > 
> > > What previous mail?  I don't see a patch 2/2 here, did you not
> > > cc:
> > > me?
> > > 
> > > thanks,
> > > 
> > > greg kh
> > 
> > I'm so sorry Greg, I made a mistake. Please find hereby the patch
> > 2/2.
> > Let me know if you want me to merge into 1 commit.
> 
> No, multiple patches are good.
> 
> And the first patch really should be split up into smaller pieces
> too.
> Each patch should only do 1 thing, not lots of things all at once.  
> 
> Can you do that and send a patch series please?
> 
> thanks,
> 
> greg k-h

Well noted, I will do it tomorrow

Regards

Akira Shimahara